thionyl chloride; N,N-dimethyl-formamide in hexane 1 h; Heating;

1: 82 percent / K2CO3 / acetone / 3 h / Heating 2: 80 percent / tBuOK / dimethylsulfoxide / 2 h / 70 °C 3: SOCl2; DMF / hexane / 1 h / Heating View Scheme

1: 80 percent / tBuOK / dimethylsulfoxide / 2 h / 70 °C 2: SOCl2; DMF / hexane / 1 h / Heating View Scheme